Book Values / VRT Calculator

[EDIT: I thought I was being clear but obviously not: My enquiry is about book values, not VRT values. The reference to the VRT calculator is just in relation to the book values it provides. --adam]

Are these figures reliable, and if so do they need to be adjusted?

I was doing a bit of research on importing an LS400 and noticed that the VRT calculator book value is way lower than the prices being looked for on classified sites, even if you tack on the VRT. (The prices are variable too - there's three '95 LS400's on Carzone atm, priced at 7 grand, 8 grand and 10 grand - but that's par for the course.)

Just curious if the VRT calculator can be relied upon to any degree, even if the figures have to be adjusted by a certain amount. If not, is there another way of finding out book value? Parker's is only good for certain cars, and presumably their book values are away off ours anyway.

adam